.div_middle{
    margin: 0 auto;
    width: 40%;
    /*border: 1px solid black;*/
    height: 500px;
}

.div_input{
    width: 100%;
    border: 1px solid red;
    height: 20%;
}

.input_number{
    height: 100%;
    font-size: 2rem;
    color: white;
    background-color: #5d5c5a;
}

.div_btnRow{
    width: 100%;
    border: 1px solid blue;
    height: 50px;

}

.rowBtn{
    width: 100%;
    height: 50px;
    background-color: #6c6b69;
    color: white;
    font-size: 18px;
    font-weight: bolder;
}

.rowBtn2{
    width: 100%;
    height: 50px;
    background-color: #fa9e47;
    font-size: 18px;
    font-weight: bolder;
    color: white;
}

.rowBtn3{
    width: 100%;
    height: 50px;
    background-color: #858482;
    font-size: 18px;
    font-weight: bolder;
    color: white;
}

.rowBtn4{
    width: 100%;
    height: 50px;
    background-color: #fa9e47;
    font-size: 18px;
    font-weight: bolder;
    color: black;
}